Discussion
Which statement about global warming potential is TRUE?
Answer: C
Correct answer: It must be quoted with a time horizon
Global warming potential compares a gas's cumulative radiative effect with that of carbon dioxide over a stated period, so the period is part of the definition. Methane's value is about 28 over a hundred years but around 80 over twenty, because it is a strong absorber with a short atmospheric lifetime.
The choice therefore changes how a methane reduction is valued against a carbon dioxide one, which has real policy consequences. It applies to all greenhouse gases, with carbon dioxide as the reference at unity, and has nothing to do with acidification.
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